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1. 发明授权

US4827503A Integrated ringing circuit and a ring trip circuit for the same 失效
标题翻译：集成振铃电路和环路跳闸电路相同
公开(公告)号：US4827503A
公开(公告)日：1989-05-02
申请号：US110460
申请日：1987-10-20
申请人： Kenji Takato , Kazumi Kinoshita , Toshiro Tojo , Yuzo Yamamoto
发明人： Kenji Takato , Kazumi Kinoshita , Toshiro Tojo , Yuzo Yamamoto
IPC分类号： H04M19/02 , H04M1/66
CPC分类号： H04M19/026 , H04M19/023
摘要： A constant current circuit, including a constant current source which draws a current and a constant current source which sends a current, is connected to a two-wire subscriber line. A ringing signal made up of constant stream of positive and negative current signals is transmitted to the telephone line. The OFF-hook condition of a telephone set is detected by comparing the output voltage of a constant current circuit with a reference voltage for ring trip.
摘要翻译：一个恒流电路，包括一个电流源和一个恒定的电流源，它产生一个电流，连接到两线用户线。由正和负电流信号的恒定流组成的振铃信号被发送到电话线。通过将恒流电路的输出电压与环路跳闸的参考电压进行比较来检测电话机的摘机状态。

2. 发明授权

US4935960A Battery feed circuit 失效
标题翻译：电池供电电路
公开(公告)号：US4935960A
公开(公告)日：1990-06-19
申请号：US409701
申请日：1989-09-20
申请人： Kenji Takato , Toshiro Tojo , Kazumi Kinoshita , Yuzo Yamamoto
发明人： Kenji Takato , Toshiro Tojo , Kazumi Kinoshita , Yuzo Yamamoto
IPC分类号： H04M19/00
CPC分类号： H04M19/005
摘要： A battery feed circuit including a main battery feed part and its peripheral circuits provided in a line circuit of a switching system. The peripheral circuits include the following: First, a means for forming a low impedance with respect to in-phase signals, simply realized by a capacitor; second, a bias circuit able to suppress the entry of power source noise and easily switch magnitudes of bias voltages and polarities, realized by a bias voltage generating means, a buffer means, and and AC bypass capacitor; third, a battery feed current control circuit able to suppress overflow of battery feed current when the distance to the subscriber is short, which detects an overcurrent component above a predetermined value, and, in accordance with the same, changes the bias voltage; fourth, a battery feed current supervising circuit able to detect current in both the forward and reverse directions, realized by an emitter-follower pair and a voltage/current converting resistor; fifth, a circuit for detecting bidirectional battery feed currents at a high precision, which is formed by forward direction and reverse direction current detection means provided with V.sub.BE cancelling means; and sixth, an overcurrent protection circuit, which changes the voltage applied between the inputs (+,-) of a transconductance amplifier forming the main battery feed part in accordance with an excess voltage.

3. 发明授权

US4912429A Operational amplifier 失效
公开(公告)号：US4912429A
公开(公告)日：1990-03-27
申请号：US326177
申请日：1989-03-20
申请人： Kenji Takato , Toshiro Tojo , Kazumi Kinoshita , Yuzo Yamamoto
发明人： Kenji Takato , Toshiro Tojo , Kazumi Kinoshita , Yuzo Yamamoto
IPC分类号： H03F1/08 , H03F3/45
CPC分类号： H03F3/45085 , H03F1/083 , H03F2200/516 , H03F2203/45496 , H03F2203/45664 , H03F2203/45708
摘要： An operational amplifier for producing an output signal representing the voltage differential between two input signals is powered by first, second and third power sources respectively having high, intermediate and low output voltage levels. A voltage buffer circuit, which is connected to the second power source, interconnects a constant current source, which is connected to the first power source, and an amplifier means, which is connected to the third power source, and separates the constant current source from the third power source. A differential amplifier in the amplifier means responds to the two input signals for producing a voltage differential output signal, and an output circuit connected between the second and third power sources receives the voltage differential output signal of the differential amplifier for producing the voltage differential output signal of the operational amplifier.

4. 发明授权

US5113426A Ground fault detector 失效
标题翻译：地面故障检测器
公开(公告)号：US5113426A
公开(公告)日：1992-05-12
申请号：US573130
申请日：1990-09-19
申请人： Kazumi Kinoshita , Kenji Takato , Toshiro Tojo
发明人： Kazumi Kinoshita , Kenji Takato , Toshiro Tojo
IPC分类号： H04M3/30 , H04M19/00
CPC分类号： H04M19/008 , H04M19/006 , H04M3/30
摘要： In a ground fault detector for long distance subscriber lines accommodated in a small capacity digital electronic exchange, a DC/DC converter for power supply is stopped during detection of ground fault. Upon reception of the stop signal, the DC/DC converter converts the power supply voltage for the subscribers to a voltage as the system power supply of the exchange, namely to a low voltage before voltage conversion of the DC/DC converter. The battery feed circuit can maintain the alarm condition, even if a current flows continuously to the battery feed resistor due to a ground fault, until the ground fault is recovered by the maintenance person without breaking the resistor.
摘要翻译： PCT No.PCT / JP90 / 00036 Sec。 371 1990年9月19日第 102（e）1990年9月19日PCT PCT 1990年1月12日PCT公布。出版物WO90 / 08441 日期：1990年7月26日。在容纳在小容量数字电子交换机中的长距离用户线路的接地故障检测器中，在接地故障检测期间停止用于电源的DC / DC转换器。在接收到停止信号时，DC / DC转换器将用户的电源电压转换为电压作为交换机的系统电源，即在DC / DC转换器的电压转换之前为低电压。即使电流由于接地故障而连续流向电池供电电阻，电池供电电路也可以保持报警状态，直到维护人员接地故障恢复，而不会中断电阻。

5. 发明授权

US4862309A Protection circuit for battery feed circuit 失效
标题翻译：电池供电电路保护电路
公开(公告)号：US4862309A
公开(公告)日：1989-08-29
申请号：US207635
申请日：1988-06-16
申请人： Toshiro Tojo , Kenji Takato , Kazumi Kinoshita , Yuzo Yamamoto
发明人： Toshiro Tojo , Kenji Takato , Kazumi Kinoshita , Yuzo Yamamoto
IPC分类号： H02H9/02 , H04M3/18 , H04M19/00
CPC分类号： H04M3/18 , H02H9/025 , H04M19/001
摘要： A protection circuit for a battery feed circuit used in a switching system. The protection circuit is comprised of: a supervising circuit for detecting an abnormal current flowing through a battery feed resistor; and a voltage limiting circuit for clamping a voltage across the battery feed resistor when the abnormal current is detected. Further, a control circuit is employed for stopping an operational amplifier, which is a component of a conventional battery feed circuit, when the abnormal current is detected.

6. 发明授权

US4995111A Ring trip circuit for subscriber telephone 失效
标题翻译：用户电话的环路跳闸电路
公开(公告)号：US4995111A
公开(公告)日：1991-02-19
申请号：US320297
申请日：1989-02-21
申请人： Toshiro Tojo , Kenji Takato , Kazumi Kinoshita , Yuzo Yamamoto , Yozo Iketani , Shin-ichi Ito
发明人： Toshiro Tojo , Kenji Takato , Kazumi Kinoshita , Yuzo Yamamoto , Yozo Iketani , Shin-ichi Ito
IPC分类号： H04M19/02
CPC分类号： H04M19/026
摘要： An improved ring trip circuit for a subscriber telephone, for detecting an on-hook state or an off-hook state of the telephone. The ring trip circuit can be formed in a small size and can be formed by a LSI. The ring trip circuit includes a voltage detecting circuit (2), for detecting a voltage difference (.DELTA.V) between both ends of a ringer sending resistor, having a first circuit (S1, S2, A1.about.B3) converting the voltage difference to a current difference, and further having a second circuit (F) converting the current difference to a voltage, the voltage difference varying in response to the on-hook state or the off-hook state of the telephone, and a state detecting circuit (3) for detecting the on-hook state or the off-hook state in response to a value of the voltage from the voltage detecting circuit. The voltage detecting circuit is formed by a plurality of current mirror circuits, each of which includes at least two transistors. The state detecting circuit includes a comparator circuit (CP1) formed by a plurality of transistors.
摘要翻译： PCT No.PCT / JP88 / 00607 Sec。 371日期1989年2月21日 102（e）日期1989年2月21日PCT Filed 1988年6月18日PCT Pub。出版物WO88 / 10542 日期为1988年12月29日。一种用于用户电话的改进的环路跳闸电路，用于检测电话的挂机状态或摘机状态。环形跳闸电路可以形成为小尺寸并且可以由LSI形成。环路跳闸电路包括电压检测电路（2），用于检测振铃发送电阻器两端之间的电压差（DELTA V），该电路具有将电压差转换为a的第一电路（S1，S2，A1差分B3）并且还具有将电流差转换为电压的第二电路（F），所述电压差响应于电话的挂机状态或摘机状态而变化，以及状态检测电路（3）用于响应于来自电压检测电路的电压的值来检测挂机状态或摘机状态。电压检测电路由多个电流镜电路形成，每个电流镜电路包括至少两个晶体管。状态检测电路包括由多个晶体管形成的比较器电路（CP1）。

7. 发明授权

US5335271A Ring trip detection circuit 失效
标题翻译：环路跳闸检测电路
公开(公告)号：US5335271A
公开(公告)日：1994-08-02
申请号：US938771
申请日：1992-09-03
申请人： Kenji Takato , Kazumi Kinoshita , Kiyoshi Kurosaki , Taichi Kosako , Kazuyuki Minohara
发明人： Kenji Takato , Kazumi Kinoshita , Kiyoshi Kurosaki , Taichi Kosako , Kazuyuki Minohara
IPC分类号： H04M3/02 , H04M19/02
CPC分类号： H04M19/026
摘要： A ring trip detection circuit detects an OFF-hooked state of a telephone receiver during ringing of a telephone set by detecting a change in a voltage across two terminals of a transmission resistor through which a ringing signal is supplied to the telephone set from a ringing signal source. The ring trip detection circuit includes a voltage dividing circuit coupled to the two terminals of the transmission resistor for dividing voltages at the two terminals and for outputting divided voltages, a pair of transistors having bases for respectively receiving the divided voltages from the voltage dividing circuit, a constant current source, a pair of resistors having first terminals respectively coupled to emitters of the pair of transistors and second terminals coupled in common to the constant current source, where the pair of resistors have the same resistance, and a current mirror circuit coupled to collectors of the pair of transistors for outputting an output current which indicates whether or not the telephone receiver is OFF-hooked.
摘要翻译：环路跳闸检测电路通过检测发送电阻的两端的电压变化来检测电话接收机的摘机状态，通过该电阻将振铃信号从振铃信号提供给电话机资源。环路跳闸检测电路包括：分压电路，耦合到发送电阻器的两个端子，用于分割两个端子处的电压，并输出分压;一对晶体管，具有分别接收来自分压电路的分压电压的基极; 恒定电流源，一对电阻器，其具有分别耦合到所述一对晶体管的发射极的第一端子和共同耦合到恒定电流源的第二端子，其中所述一对电阻器具有相同的电阻;以及电流镜电路，耦合到用于输出表示电话接收机是否脱机的输出电流的一对晶体管的集电极。

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